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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title>Document</title>
</head>
<body>
<div id="div1" onclick="alert(11)" style="width:100px; height:100px; background:red;"></div>
</body>
</html>
<script>
function trigger(el,type){
try{
//w3c
var evt = document.createEvent('Event');
evt.initEvent(type,true,true);
el.dispatchEvent(evt);
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//ie
el.fireEvent('on' + type);
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var div = document.getElementById('div1');
trigger(div,'click');
</script>
